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Finding the Fourth Proportional to 252.48, 378.31 and 136.98

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Solution

The fourth proportional to 252.48, 378.31 and 136.98 is: 205.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.48 : 378.31 = 136.98 : x
  2. Step 2: Convert to fraction form
    252.48/378.31 = 136.98/x
  3. Step 3: Cross multiply
    252.48x = 378.31 × 136.98
  4. Step 4: Simplify right side
    252.48x = 51,820.90
  5. Step 5: Solve for x
    x = 51,820.90/252.48
  6. Step 6: Final answer
    x = 205.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.